blob: 5b398421b0518130240157dd2b02aa4c77a6ed0a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/nfsd/nfs4idmap.c
3 *
4 * Mapping of UID/GIDs to name and vice versa.
5 *
6 * Copyright (c) 2002, 2003 The Regents of the University of
7 * Michigan. All rights reserved.
8 *
9 * Marius Aamodt Eriksen <marius@umich.edu>
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/module.h>
38#include <linux/init.h>
39
40#include <linux/mm.h>
41#include <linux/utsname.h>
42#include <linux/errno.h>
43#include <linux/string.h>
44#include <linux/sunrpc/clnt.h>
45#include <linux/nfs.h>
46#include <linux/nfs4.h>
47#include <linux/nfs_fs.h>
48#include <linux/nfs_page.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/sunrpc/cache.h>
50#include <linux/nfsd_idmap.h>
51#include <linux/list.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/time.h>
53#include <linux/seq_file.h>
54#include <linux/sunrpc/svcauth.h>
55
56/*
57 * Cache entry
58 */
59
60/*
61 * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
62 * that.
63 */
64
65#define IDMAP_TYPE_USER 0
66#define IDMAP_TYPE_GROUP 1
67
68struct ent {
69 struct cache_head h;
70 int type; /* User / Group */
71 uid_t id;
72 char name[IDMAP_NAMESZ];
73 char authname[IDMAP_NAMESZ];
74};
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076/* Common entry handling */
77
78#define ENT_HASHBITS 8
79#define ENT_HASHMAX (1 << ENT_HASHBITS)
80#define ENT_HASHMASK (ENT_HASHMAX - 1)
81
NeilBrownf9ecc922006-03-27 01:15:06 -080082static void
83ent_init(struct cache_head *cnew, struct cache_head *citm)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
NeilBrownf9ecc922006-03-27 01:15:06 -080085 struct ent *new = container_of(cnew, struct ent, h);
86 struct ent *itm = container_of(citm, struct ent, h);
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 new->id = itm->id;
89 new->type = itm->type;
90
91 strlcpy(new->name, itm->name, sizeof(new->name));
92 strlcpy(new->authname, itm->authname, sizeof(new->name));
93}
94
NeilBrownfd39ca92005-06-23 22:04:03 -070095static void
NeilBrownbaab9352006-03-27 01:15:09 -080096ent_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
NeilBrownbaab9352006-03-27 01:15:09 -080098 struct ent *map = container_of(ref, struct ent, h.ref);
99 kfree(map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
NeilBrownf9ecc922006-03-27 01:15:06 -0800102static struct cache_head *
103ent_alloc(void)
104{
105 struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
106 if (e)
107 return &e->h;
108 else
109 return NULL;
110}
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112/*
113 * ID -> Name cache
114 */
115
116static struct cache_head *idtoname_table[ENT_HASHMAX];
117
118static uint32_t
119idtoname_hash(struct ent *ent)
120{
121 uint32_t hash;
122
123 hash = hash_str(ent->authname, ENT_HASHBITS);
124 hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
125
126 /* Flip LSB for user/group */
127 if (ent->type == IDMAP_TYPE_GROUP)
128 hash ^= 1;
129
130 return hash;
131}
132
133static void
134idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
135 int *blen)
136{
137 struct ent *ent = container_of(ch, struct ent, h);
138 char idstr[11];
139
140 qword_add(bpp, blen, ent->authname);
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700141 snprintf(idstr, sizeof(idstr), "%u", ent->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
143 qword_add(bpp, blen, idstr);
144
145 (*bpp)[-1] = '\n';
146}
147
NeilBrownf9ecc922006-03-27 01:15:06 -0800148static int
149idtoname_match(struct cache_head *ca, struct cache_head *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
NeilBrownf9ecc922006-03-27 01:15:06 -0800151 struct ent *a = container_of(ca, struct ent, h);
152 struct ent *b = container_of(cb, struct ent, h);
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 return (a->id == b->id && a->type == b->type &&
155 strcmp(a->authname, b->authname) == 0);
156}
157
158static int
159idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
160{
161 struct ent *ent;
162
163 if (h == NULL) {
164 seq_puts(m, "#domain type id [name]\n");
165 return 0;
166 }
167 ent = container_of(h, struct ent, h);
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700168 seq_printf(m, "%s %s %u", ent->authname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
170 ent->id);
171 if (test_bit(CACHE_VALID, &h->flags))
172 seq_printf(m, " %s", ent->name);
173 seq_printf(m, "\n");
174 return 0;
175}
176
177static void
178warn_no_idmapd(struct cache_detail *detail)
179{
180 printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
181 detail->last_close? "died" : "not been started");
182}
183
184
185static int idtoname_parse(struct cache_detail *, char *, int);
NeilBrownf9ecc922006-03-27 01:15:06 -0800186static struct ent *idtoname_lookup(struct ent *);
187static struct ent *idtoname_update(struct ent *, struct ent *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
NeilBrownfd39ca92005-06-23 22:04:03 -0700189static struct cache_detail idtoname_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700190 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 .hash_size = ENT_HASHMAX,
192 .hash_table = idtoname_table,
193 .name = "nfs4.idtoname",
194 .cache_put = ent_put,
195 .cache_request = idtoname_request,
196 .cache_parse = idtoname_parse,
197 .cache_show = idtoname_show,
198 .warn_no_listener = warn_no_idmapd,
NeilBrownf9ecc922006-03-27 01:15:06 -0800199 .match = idtoname_match,
200 .init = ent_init,
201 .update = ent_init,
202 .alloc = ent_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203};
204
Harvey Harrisona254b242008-02-20 12:49:00 -0800205static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
207{
208 struct ent ent, *res;
209 char *buf1, *bp;
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400210 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 int error = -EINVAL;
212
213 if (buf[buflen - 1] != '\n')
214 return (-EINVAL);
215 buf[buflen - 1]= '\0';
216
217 buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
218 if (buf1 == NULL)
219 return (-ENOMEM);
220
221 memset(&ent, 0, sizeof(ent));
222
223 /* Authentication name */
224 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
225 goto out;
226 memcpy(ent.authname, buf1, sizeof(ent.authname));
227
228 /* Type */
229 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
230 goto out;
231 ent.type = strcmp(buf1, "user") == 0 ?
232 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
233
234 /* ID */
235 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
236 goto out;
237 ent.id = simple_strtoul(buf1, &bp, 10);
238 if (bp == buf1)
239 goto out;
240
241 /* expiry */
242 ent.h.expiry_time = get_expiry(&buf);
243 if (ent.h.expiry_time == 0)
244 goto out;
245
NeilBrownf9ecc922006-03-27 01:15:06 -0800246 error = -ENOMEM;
247 res = idtoname_lookup(&ent);
248 if (!res)
249 goto out;
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 /* Name */
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400252 error = -EINVAL;
253 len = qword_get(&buf, buf1, PAGE_SIZE);
254 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 goto out;
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400256 if (len == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 set_bit(CACHE_NEGATIVE, &ent.h.flags);
J. Bruce Fieldsd4395e02007-10-26 13:32:50 -0400258 else if (len >= IDMAP_NAMESZ)
259 goto out;
260 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 memcpy(ent.name, buf1, sizeof(ent.name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 error = -ENOMEM;
NeilBrownf9ecc922006-03-27 01:15:06 -0800263 res = idtoname_update(&ent, res);
264 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 goto out;
266
NeilBrownbaab9352006-03-27 01:15:09 -0800267 cache_put(&res->h, &idtoname_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269 error = 0;
270out:
271 kfree(buf1);
272
273 return error;
274}
275
NeilBrownf9ecc922006-03-27 01:15:06 -0800276
277static struct ent *
278idtoname_lookup(struct ent *item)
279{
280 struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache,
281 &item->h,
282 idtoname_hash(item));
283 if (ch)
284 return container_of(ch, struct ent, h);
285 else
286 return NULL;
287}
288
289static struct ent *
290idtoname_update(struct ent *new, struct ent *old)
291{
292 struct cache_head *ch = sunrpc_cache_update(&idtoname_cache,
293 &new->h, &old->h,
294 idtoname_hash(new));
295 if (ch)
296 return container_of(ch, struct ent, h);
297 else
298 return NULL;
299}
300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302/*
303 * Name -> ID cache
304 */
305
306static struct cache_head *nametoid_table[ENT_HASHMAX];
307
308static inline int
309nametoid_hash(struct ent *ent)
310{
311 return hash_str(ent->name, ENT_HASHBITS);
312}
313
NeilBrownfd39ca92005-06-23 22:04:03 -0700314static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
316 int *blen)
317{
318 struct ent *ent = container_of(ch, struct ent, h);
319
320 qword_add(bpp, blen, ent->authname);
321 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
322 qword_add(bpp, blen, ent->name);
323
324 (*bpp)[-1] = '\n';
325}
326
NeilBrownf9ecc922006-03-27 01:15:06 -0800327static int
328nametoid_match(struct cache_head *ca, struct cache_head *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329{
NeilBrownf9ecc922006-03-27 01:15:06 -0800330 struct ent *a = container_of(ca, struct ent, h);
331 struct ent *b = container_of(cb, struct ent, h);
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
334 strcmp(a->authname, b->authname) == 0);
335}
336
337static int
338nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
339{
340 struct ent *ent;
341
342 if (h == NULL) {
343 seq_puts(m, "#domain type name [id]\n");
344 return 0;
345 }
346 ent = container_of(h, struct ent, h);
347 seq_printf(m, "%s %s %s", ent->authname,
348 ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
349 ent->name);
350 if (test_bit(CACHE_VALID, &h->flags))
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700351 seq_printf(m, " %u", ent->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 seq_printf(m, "\n");
353 return 0;
354}
355
NeilBrownf9ecc922006-03-27 01:15:06 -0800356static struct ent *nametoid_lookup(struct ent *);
357static struct ent *nametoid_update(struct ent *, struct ent *);
NeilBrownfd39ca92005-06-23 22:04:03 -0700358static int nametoid_parse(struct cache_detail *, char *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
NeilBrownfd39ca92005-06-23 22:04:03 -0700360static struct cache_detail nametoid_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700361 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 .hash_size = ENT_HASHMAX,
363 .hash_table = nametoid_table,
364 .name = "nfs4.nametoid",
365 .cache_put = ent_put,
366 .cache_request = nametoid_request,
367 .cache_parse = nametoid_parse,
368 .cache_show = nametoid_show,
369 .warn_no_listener = warn_no_idmapd,
NeilBrownf9ecc922006-03-27 01:15:06 -0800370 .match = nametoid_match,
371 .init = ent_init,
372 .update = ent_init,
373 .alloc = ent_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374};
375
NeilBrownfd39ca92005-06-23 22:04:03 -0700376static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
378{
379 struct ent ent, *res;
380 char *buf1;
381 int error = -EINVAL;
382
383 if (buf[buflen - 1] != '\n')
384 return (-EINVAL);
385 buf[buflen - 1]= '\0';
386
387 buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
388 if (buf1 == NULL)
389 return (-ENOMEM);
390
391 memset(&ent, 0, sizeof(ent));
392
393 /* Authentication name */
394 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
395 goto out;
396 memcpy(ent.authname, buf1, sizeof(ent.authname));
397
398 /* Type */
399 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
400 goto out;
401 ent.type = strcmp(buf1, "user") == 0 ?
402 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
403
404 /* Name */
405 error = qword_get(&buf, buf1, PAGE_SIZE);
406 if (error <= 0 || error >= IDMAP_NAMESZ)
407 goto out;
408 memcpy(ent.name, buf1, sizeof(ent.name));
409
410 /* expiry */
411 ent.h.expiry_time = get_expiry(&buf);
412 if (ent.h.expiry_time == 0)
413 goto out;
414
415 /* ID */
416 error = get_int(&buf, &ent.id);
417 if (error == -EINVAL)
418 goto out;
419 if (error == -ENOENT)
420 set_bit(CACHE_NEGATIVE, &ent.h.flags);
421
422 error = -ENOMEM;
NeilBrownf9ecc922006-03-27 01:15:06 -0800423 res = nametoid_lookup(&ent);
424 if (res == NULL)
425 goto out;
426 res = nametoid_update(&ent, res);
427 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 goto out;
429
NeilBrownbaab9352006-03-27 01:15:09 -0800430 cache_put(&res->h, &nametoid_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 error = 0;
432out:
433 kfree(buf1);
434
435 return (error);
436}
437
NeilBrownf9ecc922006-03-27 01:15:06 -0800438
439static struct ent *
440nametoid_lookup(struct ent *item)
441{
442 struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache,
443 &item->h,
444 nametoid_hash(item));
445 if (ch)
446 return container_of(ch, struct ent, h);
447 else
448 return NULL;
449}
450
451static struct ent *
452nametoid_update(struct ent *new, struct ent *old)
453{
454 struct cache_head *ch = sunrpc_cache_update(&nametoid_cache,
455 &new->h, &old->h,
456 nametoid_hash(new));
457 if (ch)
458 return container_of(ch, struct ent, h);
459 else
460 return NULL;
461}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
463/*
464 * Exported API
465 */
466
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500467int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468nfsd_idmap_init(void)
469{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500470 int rv;
471
472 rv = cache_register(&idtoname_cache);
473 if (rv)
474 return rv;
475 rv = cache_register(&nametoid_cache);
476 if (rv)
477 cache_unregister(&idtoname_cache);
478 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479}
480
481void
482nfsd_idmap_shutdown(void)
483{
J. Bruce Fieldsdf95a9d2007-11-08 16:09:59 -0500484 cache_unregister(&idtoname_cache);
485 cache_unregister(&nametoid_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486}
487
488/*
489 * Deferred request handling
490 */
491
492struct idmap_defer_req {
493 struct cache_req req;
494 struct cache_deferred_req deferred_req;
495 wait_queue_head_t waitq;
496 atomic_t count;
497};
498
499static inline void
500put_mdr(struct idmap_defer_req *mdr)
501{
502 if (atomic_dec_and_test(&mdr->count))
503 kfree(mdr);
504}
505
506static inline void
507get_mdr(struct idmap_defer_req *mdr)
508{
509 atomic_inc(&mdr->count);
510}
511
512static void
513idmap_revisit(struct cache_deferred_req *dreq, int toomany)
514{
515 struct idmap_defer_req *mdr =
516 container_of(dreq, struct idmap_defer_req, deferred_req);
517
518 wake_up(&mdr->waitq);
519 put_mdr(mdr);
520}
521
522static struct cache_deferred_req *
523idmap_defer(struct cache_req *req)
524{
525 struct idmap_defer_req *mdr =
526 container_of(req, struct idmap_defer_req, req);
527
528 mdr->deferred_req.revisit = idmap_revisit;
529 get_mdr(mdr);
530 return (&mdr->deferred_req);
531}
532
533static inline int
NeilBrownf9ecc922006-03-27 01:15:06 -0800534do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 struct cache_detail *detail, struct ent **item,
536 struct idmap_defer_req *mdr)
537{
NeilBrownf9ecc922006-03-27 01:15:06 -0800538 *item = lookup_fn(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (!*item)
540 return -ENOMEM;
541 return cache_check(detail, &(*item)->h, &mdr->req);
542}
543
544static inline int
NeilBrownf9ecc922006-03-27 01:15:06 -0800545do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 struct ent *key, struct cache_detail *detail,
547 struct ent **item)
548{
549 int ret = -ENOMEM;
550
NeilBrownf9ecc922006-03-27 01:15:06 -0800551 *item = lookup_fn(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 if (!*item)
553 goto out_err;
554 ret = -ETIMEDOUT;
555 if (!test_bit(CACHE_VALID, &(*item)->h.flags)
556 || (*item)->h.expiry_time < get_seconds()
557 || detail->flush_time > (*item)->h.last_refresh)
558 goto out_put;
559 ret = -ENOENT;
560 if (test_bit(CACHE_NEGATIVE, &(*item)->h.flags))
561 goto out_put;
562 return 0;
563out_put:
NeilBrownbaab9352006-03-27 01:15:09 -0800564 cache_put(&(*item)->h, detail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565out_err:
566 *item = NULL;
567 return ret;
568}
569
570static int
571idmap_lookup(struct svc_rqst *rqstp,
NeilBrownf9ecc922006-03-27 01:15:06 -0800572 struct ent *(*lookup_fn)(struct ent *), struct ent *key,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 struct cache_detail *detail, struct ent **item)
574{
575 struct idmap_defer_req *mdr;
576 int ret;
577
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700578 mdr = kzalloc(sizeof(*mdr), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 if (!mdr)
580 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 atomic_set(&mdr->count, 1);
582 init_waitqueue_head(&mdr->waitq);
583 mdr->req.defer = idmap_defer;
584 ret = do_idmap_lookup(lookup_fn, key, detail, item, mdr);
585 if (ret == -EAGAIN) {
586 wait_event_interruptible_timeout(mdr->waitq,
587 test_bit(CACHE_VALID, &(*item)->h.flags), 1 * HZ);
588 ret = do_idmap_lookup_nowait(lookup_fn, key, detail, item);
589 }
590 put_mdr(mdr);
591 return ret;
592}
593
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700594static char *
595rqst_authname(struct svc_rqst *rqstp)
596{
597 struct auth_domain *clp;
598
599 clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
600 return clp->name;
601}
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603static int
604idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
605 uid_t *id)
606{
607 struct ent *item, key = {
608 .type = type,
609 };
610 int ret;
611
612 if (namelen + 1 > sizeof(key.name))
613 return -EINVAL;
614 memcpy(key.name, name, namelen);
615 key.name[namelen] = '\0';
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700616 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item);
618 if (ret == -ENOENT)
619 ret = -ESRCH; /* nfserr_badname */
620 if (ret)
621 return ret;
622 *id = item->id;
NeilBrownbaab9352006-03-27 01:15:09 -0800623 cache_put(&item->h, &nametoid_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 return 0;
625}
626
627static int
628idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
629{
630 struct ent *item, key = {
631 .id = id,
632 .type = type,
633 };
634 int ret;
635
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700636 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 ret = idmap_lookup(rqstp, idtoname_lookup, &key, &idtoname_cache, &item);
638 if (ret == -ENOENT)
639 return sprintf(name, "%u", id);
640 if (ret)
641 return ret;
642 ret = strlen(item->name);
643 BUG_ON(ret > IDMAP_NAMESZ);
644 memcpy(name, item->name, ret);
NeilBrownbaab9352006-03-27 01:15:09 -0800645 cache_put(&item->h, &idtoname_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 return ret;
647}
648
649int
650nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
651 __u32 *id)
652{
653 return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
654}
655
656int
657nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
658 __u32 *id)
659{
660 return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
661}
662
663int
664nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
665{
666 return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
667}
668
669int
670nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
671{
672 return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
673}